The proton spectral function determined from a consistent microscopic study of the 4He(e, e′ p)3H reaction 1566

Polarization transfer inHe4(e→,Lava1, Ryckebusch2, Overmeire3 et al. 2005Phys. Rev. C132160View full textAdd to dashboardCite

“…The data for medium-heavy nuclei like 12 C and 40 Ca, however, could be satisfactorily explained after implementing FSI mechanisms [8], thereby adopting free-nucleon electromagnetic form factors. For the 4 He nucleus, chargeexchange processes turned out to be of great importance to explain the measured T/L ratios [9,10,11]. The above-mentioned findings indicate that medium modifications of the electromagnetic form factors are apparently modest and support the picture that despite their substructure, nucleons are rather robust objects.…”

Nucleon Knockout by Intermediate Energy Electrons

“…The charge exchange contribution to reduces the longitudinal contribution with respect to the transverse, in good agreement with the Saclay data. Similar results, although not quite enough suppression, were obtained by Warmann and Langanke (169) using a resonating group method to calculate both the bound states and the scattering states from the same interaction with antisymmetrization and orthogonality enforced exactly. For MeV/c, the Buballa calculation suggests that the longitudinal cross section for is as large or larger than the longitudinal cross section for obviously, it would be interesting to test that prediction.…”